Mitel Sx 200 El/ml Technicians Handbook

Troubleshooting and Repair
51
Troubleshooting
Flowchart 4: Correcting Set / Dataset Problems
Swap the set/dataset with a known working 
set/dataset (note the revision & model).
Return faulty set / dataset for 
repair.
To clear all dynamic user features 
for a set use
DIAGNOSTIC-CLR-FEATURE
Is the fault 
corrected?Ye s
No
Ensure that valid features, such as 
Do Not Disturb, are not causing 
the set to appear faulty. 
Verify the firmware revision.
Try swapping the specific line card.
Hint: Remember to...

Technician’s Handbook
52
Flowchart 4: continued
D
See the troubleshooting procedure given for the 
set/dataset in Troubleshoot Sets of the SX-200 EL/ML 
Technical Documentation for other possible 
corrective actions.
Is the fault corrected ?
Check the cable and cable connections between the set 
and the line card.
=> Try connecting the device directly to the 
cross-connect field to verify against house wiring 
problems.
=> Try another port on the card to verify against 
backplane problems.
Ye s
NoReturn...

Troubleshooting and Repair
53
Troubleshooting
Flowchart 5: Maintenance Terminal Problems
Refer to the Maintenance Terminal Troubleshooting 
Procedures in the SX-200 EL/ML Technical 
Documentation for further possible corrective actions.
Ensure that the terminal parameters are set 
correctly. They are:
VT100 / 8 Bits / No Parity / One Stop Bit
ASCII character set
Xon/Xoff flow control
300-38, 400 baud
Pin 4 & Pin 7 high
Try a selection of baud rates from 300-38,400 and 
press Esc-6 after each change....

Technician’s Handbook
54
Interpreting the Main Control Card 
Power-Up Error Codes
The error codes listed in Table 3 may appear on the Main Control Card 
numeric display during startup. 
NOTE: 1.A normal running system may show other codes (card diagnostics or errors). 
However, during start-up, only the codes in this table are possible. Any other 
code shown during start-up indicates a faulty Main Control Card. 
2.Codes possible AFTER start-up include card diagnostics codes (last card lo-
cation tested -...

Troubleshooting and Repair
55
Troubleshooting
Restoring the Database 
Restoring the SX-200 EL/ML Database 
To restore a customer database, your communication package 
must support the Kermit protocol. We recommend Terminal or 
Hyper Terminal.
1. Select the following maintenance commands:
SYSTEM
DATABASE
RESTORE
ENTER
2. Exit to a local Kermit session.
3. Specify the name and location of the software file that you want to 
transfer to the system and send it to the system.
4. After the file transfer has...

Technician’s Handbook
56
Backing Up Log Entries
To back up log entries, your communication package must support the 
Kermit protocol.This log back-up procedure allows you to copy all 
maintenance log entries into a text file on either a directory on your PC’s 
hard disk, or on a diskette in the PC’s disk drive. 
To back up log entries:
1. Select the following commands: 
SYSTEM
DATABASE
LOGS_BACKUP
ENTER
The system prompts you for the file name. 
2. Enter the file name.
3. Press ENTER.
The system then...

Troubleshooting and Repair
57
Troubleshooting
Correcting System ID Errors
If the System Reports a System ID Mismatch
If the system reports a System ID mismatch, the problem may be one 
of the following:

The System ID module is faulty

The wrong System ID module is installed 

The Password is incorrect. 
Verify that the options selected on Form 04, System Options, and the 
password entered match the data provided on the MOSS sheet.
Contact MITEL Product Support for assistance. Have your tech ID 
number...

Technician’s Handbook
58
Powering Down the SX-200 LIGHT Control Node
1. End any customer data entry sessions. 
2. If you don’t have an up-to-date database backup, perform a 
database backup. 
3. Push the System Reset Button.
4. Remove the disks.
5. Turn off the AC power by pushing the 0 (off) button at the rear of the 
cabinet. Disconnect the power cords from the AC power source.
Powering Down the Peripheral Nodes
1. Set the Bay Power Supply switch to O (OFF).
2. Unplug the AC power cord from the rear of...

Troubleshooting and Repair
59
Troubleshooting
Powering Up the Nodes
Powering Up the SX-200 EL/ML Control Node
1. Connect the external AC power cord(s) at the rear of the node.
2. Switch on the Bay Power Supply switch to ON. Set the power 
switch(es) on the rear of the node to I (ON) or set the Bay Power 
Supply switch to I (ON).
Powering Up the SX-200 LIGHT Control Node
1. Connect the external AC power cord(s) at the rear of the cabinet. 
2. Set the power switch(es) on the rear of the node to I (ON). 
3....

Technician’s Handbook
60
Replacing Circuit Cards
Wear an anti-static wrist strap whenever you handle
circuit cards.
Replacing Peripheral Interface Cards
You may replace the peripheral interface cards with the power on.
1. From the maintenance terminal select:
DIAGNOSTICS
MORE_KEYS
BUSY-OUT
 (plid of faulty card).
2. Wait until all the circuits are busied out.
3. Replace the faulty card with a new card of the same type.
WARNING: Hazardous voltages can exist on installed peripheral 
cards even when power...